Yarn over
A yarn over is made by wrapping the yarn over the right needle without knitting a stitch. Used to create lace holes or increase stitch count.
Explanation
A yarn over (yo) is a simple knitting technique where you wrap the working yarn over the right needle before knitting the next stitch. On the next row/round, the yarn over is knitted as a normal stitch. This creates an intentional hole in the fabric and increases the stitch count by one, making it a key component of lace patterns and decorative increases. However, if done accidentally, it is called an unwanted yarn over, which creates unexpected holes and extra stitches.